package java19_1_4;

/**
 * @author yuisama
 * @date 2022/01/04 21:06
 **/
class X {
    Y y = new Y();
    public X() {
        System.out.print("X");
    }
}
class Y {
    public Y() {
        System.out.print("Y");
    }
}
public class Z extends X{
    Y y = new Y();
    public Z() {
        System.out.print("Z");
    }
    public static void main(String[] args) {
        new Z(); // YXYZ
    }
}